A
co-cathedral is a
cathedral church which shares the function of being a
bishop's seat, or
cathedra, with another cathedral, often in another city (usually a former see and/or the civil capital). Instances of this occurred in England before the
Protestant Reformation in the
dioceses of '
Bath and
Wells,' and of '
Coventry and
Lichfield.' These two dioceses were each named for both cities that served as bishop's seats.